82974 B #include <assert.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <sys/queue.h> #include <sys/types.h> #include <kvm.h> #define _KERNEL_STRUCTURES #include <sys/mqueue.h> static LIST_HEAD(, mqueue) mqueue_head = LIST_HEAD_INITIALIZER(mqueue_head); static kvm_t *kd; /* * We need an array of nlist symbols, that * terminates with a NULL n_name field. */ static struct nlist symbols[] = { { "_mqueue_head" }, { NULL } }; int main(void) { char *execfile = NULL; /* kernel executable image */ char *corefile = NULL; /* kernel memory device file */ char *swapfile = NULL; /* swap device */ /* * Get a descriptor to access kernel virtual memory via the kvm(3) * library routines. By passing NULL to the following arguments, * we imply the respective default values. */ kd = kvm_open(execfile, corefile, swapfile, O_RDONLY, "pipcs"); if (kd == NULL) exit(EXIT_FAILURE); /* Retrieve symbol table entries. */ if (kvm_nlist(kd, symbols) == -1) { perror("kvm_nlist"); exit(EXIT_FAILURE); } /* XXX: Proper error handling. */ assert(symbols[0].n_value != 0); if (kvm_read(kd, symbols[0].n_value, &mqueue_head, sizeof(mqueue_head)) != sizeof(mqueue_head)) { perror("kvm_read"); exit(EXIT_FAILURE); } /* We are done -- close kvm channel. */ if (kvm_close(kd) == -1) exit(EXIT_FAILURE); /* Enumerate message queues. */ struct mqueue mq_data; struct mqueue *mq; mq = mqueue_head.lh_first; if (kvm_read(kd, (unsigned long)mq, &mq_data, sizeof(mq_data)) == sizeof(mq_data)) { printf("%20s %10p %8x %8x %3u %6lu %6lu %6lu\n", mq_data.mq_name, mq, mq_data.mq_mode, mq_data.mq_attrib.mq_flags, mq_data.mq_refcnt, mq_data.mq_attrib.mq_maxmsg, mq_data.mq_attrib.mq_msgsize, mq_data.mq_attrib.mq_curmsgs); } else { perror("kvm_read"); } return (EXIT_SUCCESS); } 3455639875 None None TRUE